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Tool - Plumb Bob

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Plumb Bob 

Typical plumb bobs are 8 oz or 16 oz.  The best choice is 8 oz because the 16 oz ones hang too heavily on the cross strings which causes then to sag down and therefore give an error.  Any lighter than 8 oz and it won't keep the vertical string tight enough.

8 oz ones are available for about $10 in your local home center or from:



Having one 16 oz one can be useful for one off use down high walls.

16 oz ones are available for about $13 from: